9 results on '"Management strategy"'
Search Results
2. Establishment of an expansion-predicting model for invasive alien cerambycid beetle Aromia bungii based on a virtual ecology approach.
- Author
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Takeshi Osawa, Hiroshi Tsunoda, Tomohide Shimada, and Makoto Miwa
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INTRODUCED species , *BIOLOGICAL invasions , *CHERRIES , *INTRODUCED insects , *BEETLES , *SPECIES distribution - Abstract
The pragmatic management of invasive alien species should integrate two essential items: 1) management interventions and 2) a spatially explicit management plan. Predicting the future expansion of target species in a region at the early invasion stage is an important step toward the establishment of a spatially explicit management plan. However, information regarding the distributions of target species is limited, making it challenging to predict range expansions. In the present study, we established a simulation model that could predict the future expansion of the invasive insect Aromia bungii, which is harmful to Prunus trees (including cherry trees [Cerasus × yedoensis]), in Japan. We employed a virtual ecology approach that simulated species dynamics based on a simple model in Saitama Prefecture, which is in the Kanto region of Japan. Since the first record of the species in this region of Japan in 2013, its range has expanded dramatically. Three candidate pathways and combinations of these for the range expansion of A. bungii were tested to identify the major proxies of expansion for this species, followed by the validation of these results using occurrence records for the species through 2019. Both the river density model and combined river and road density models showed good predictive performance. Using these models, we established a predictive map of the future expansion of this species in the wider range of the simulation area. Based on the results, we recommend concentration of management efforts in the mid-northeast region of the Saitama Prefecture. [ABSTRACT FROM AUTHOR]
- Published
- 2022
- Full Text
- View/download PDF
3. Generating an agricultural risk map based on limited ecological information: A case study using Sicyos angulatus.
- Author
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Osawa, Takeshi, Okawa, Shigenori, Kurokawa, Shunji, and Ando, Shinichiro
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AGRICULTURE , *RISK assessment , *ECOLOGICAL research , *CUCUMBERS , *BIOLOGICAL invasions , *INTRODUCED species - Abstract
In this study, we propose a method for estimating the risk of agricultural damage caused by an invasive species when species-specific information is lacking. We defined the 'risk' as the product of the invasion probability and the area of potentially damaged crop for production. As a case study, we estimated the risk imposed by an invasive weed, Sicyos angulatus, based on simple cellular simulations and governmental data on the area of crop that could potentially be damaged in Miyagi Prefecture, Japan. Simulation results revealed that the current distribution range was sufficiently accurate for practical purposes. Using these results and records of crop areas, we present risk maps for S. angulatus in agricultural fields. Managers will be able to use these maps to rapidly establish a management plan with minimal cost. Our approach will be valuable for establishing a management plan before or during the early stages of invasion. [ABSTRACT FROM AUTHOR]
- Published
- 2016
- Full Text
- View/download PDF
4. Mating system, population growth, and management scenario for Kalanchoe pinnata in an invaded seasonally dry tropical forest.
- Author
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González de León, Salvador, Guevara, Roger, and Herrera, Ileana
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KALANCHOE , *BIOLOGICAL invasions , *PLANT populations , *TROPICAL forests , *POLLINATION - Abstract
Abstract: Ecological invasions are a major issue worldwide, where successful invasion depends on traits that facilitate dispersion, establishment, and population growth. The nonnative succulent plant Kalanchoe pinnata, reported as invasive in some countries, is widespread in remnants of seasonally dry tropical forest on a volcanic outcrop with high conservation value in east‐central Mexico where we assessed its mating system and demographic growth and identified management strategies. To understand its local mating system, we conducted hand‐pollination treatments, germination, and survival experiments. Based on the experimental data, we constructed a life‐stage population matrix, identified the key traits for population growth, weighted the contributions of vegetative and sexual reproduction, and evaluated management scenarios. Hand‐pollination treatments had slight effects on fruit and seed setting, as well as on germination. With natural pollination treatment, the successful germination of seeds from only 2/39 fruit suggests occasional effective natural cross‐pollination. The ratios of the metrics for self‐ and cross‐pollinated flowers suggest that K. pinnata is partially self‐compatible. Most of the pollinated flowers developed into fruit, but the seed germination and seedling survival rates were low. Thus, vegetative propagation and juvenile survival are the main drivers of population growth. Simulations of a virtual K. pinnata population suggest that an intense and sustained weeding campaign will reduce the population within at least 10 years. Synthesis and applications. The study population is partially self‐compatible, but sexual reproduction by K. pinnata is limited at the study site, and population growth is supported by vegetative propagation and juvenile survival. Demographic modeling provides key insights and realistic forecasts on invasion process and therefore is useful to design management strategies. [ABSTRACT FROM AUTHOR]
- Published
- 2016
- Full Text
- View/download PDF
5. Managing breaches of containment and eradication of invasive plant populations.
- Author
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Fletcher, Cameron S., Westcott, David A., Murphy, Helen T., Grice, Anthony C., Clarkson, John R., and Matthiopoulos, J.
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CONTROL of plant parasites , *INVASIVE plants , *PLANT populations , *ECTOPARASITIC infestations , *PLANT dispersal - Abstract
Containment can be a viable strategy for managing invasive plants, but it is not always cheaper than eradication. In many cases, converting a failed eradication programme to a containment programme is not economically justified. Despite this, many contemporary invasive plant management strategies invoke containment as a fallback for failed eradication, often without detailing how containment would be implemented., We demonstrate a generalized analysis of the costs of eradication and containment, applicable to any plant invasion for which infestation size, dispersal distance, seed bank lifetime and the economic discount rate are specified. We estimate the costs of adapting eradication and containment in response to six types of breach and calculate under what conditions containment may provide a valid fallback to a breached eradication programme., We provide simple, general formulae and plots that can be applied to any invasion and show that containment will be cheaper than eradication only when the size of the occupied zone exceeds a multiple of the dispersal distance determined by seed bank longevity and the discount rate. Containment becomes proportionally cheaper than eradication for invaders with smaller dispersal distances, longer lived seed banks, or for larger discount rates., Both containment and eradication programmes are at risk of breach. Containment is less exposed to risk from reproduction in the 'occupied zone' and three types of breach that lead to a larger 'occupied zone', but more exposed to one type of breach that leads to a larger 'buffer zone'., For a well-specified eradication programme, only the three types of breach leading to reproduction in or just outside the buffer zone can justify falling back to containment, and only if the expected costs of eradication and containment were comparable before the breach., Synthesis and applications. Weed management plans must apply a consistent definition of containment and provide sufficient implementation detail to assess its feasibility. If the infestation extent, dispersal capacity, seed bank longevity and economic discount rate are specified, the general results presented here can be used to assess whether containment can outperform eradication, and under what conditions it would provide a valid fallback to a breached eradication programme. [ABSTRACT FROM AUTHOR]
- Published
- 2015
- Full Text
- View/download PDF
6. Impacts of climate change on geographical distributions of invasive ascidians
- Author
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Hugh J. MacIsaac, Aibin Zhan, César Capinha, Zhixin Zhang, Xavier Turon, Dirk N. Karger, and Repositório da Universidade de Lisboa
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0106 biological sciences ,Mediterranean climate ,Climate Change ,Effects of global warming on oceans ,Climate change ,Introduced species ,Aquatic Science ,Oceanography ,010603 evolutionary biology ,01 natural sciences ,Benthos ,Animals ,Marine ecosystem ,Ecosystem ,Urochordata ,14. Life underwater ,Biological invasions ,Management strategy ,Ecology ,010604 marine biology & hydrobiology ,fungi ,Global warming ,Temperature ,Species distribution model ,General Medicine ,15. Life on land ,Pollution ,Europe ,Habitat ,Geography ,13. Climate action ,Introduced Species - Abstract
Este artículo contiene 12 páginas, 7 figuras, 2 tablas., Ocean warming associated with global climate change renders marine ecosystems susceptible to biological invasions. Here, we used species distribution models to project habitat suitability for eight invasive ascidians under present-day and future climate scenarios. Distance to shore and maximum sea surface temperature were identified as the most important variables affecting species distributions. Results showed that eight ascidians might respond differently to future climate change. Alarmingly, currently colonized areas are much smaller than predicted, suggesting ascidians may expand their invasive ranges. Areas such as Americas, Europe and Western Pacific have high risks of receiving new invasions. In contrast, African coasts, excluding the Mediterranean side, are not prone to new invasions, likely due to the high sea surface temperature there. Our results highlight the importance of climate change impacts on future invasions and the need for accurate modelling of invasion risks, which can be used as guides to develop management strategies., This work was supported by the National Natural Science Foundation of China (Nos. 31622011, 31772449) to AZ, the project CTM 2017-88080 (MCIU/AEI/ FEDER/UE) of the Spanish Government to XT, an NSERC Discovery grant and Canada Research Chair in Aquatic Invasive Species to HJM. CC was funded by National Funds through FCT, I.P., under the programme of ‘Stimulus of Scientific Employment – Individual Support’ within the contract ‘CEECIND/02037/2017’. DNK received funding from the ERA-Net BiodivERsA - Belmont Forum, with the national funder Swiss National Foundation (20BD21_184131), part of the 2018 Joint call BiodivERsA-Belmont Forum call (project ‘FutureWeb’).
- Published
- 2020
7. Impacts of climate change on geographical distributions of invasive ascidians.
- Author
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Zhang, Zhixin, Capinha, César, Karger, Dirk N., Turon, Xavier, MacIsaac, Hugh J., and Zhan, Aibin
- Subjects
- *
CLIMATE change , *OCEAN temperature , *GLOBAL warming , *BIOLOGICAL invasions , *SEA squirts , *PHYTOGEOGRAPHY , *OCEAN acidification - Abstract
Ocean warming associated with global climate change renders marine ecosystems susceptible to biological invasions. Here, we used species distribution models to project habitat suitability for eight invasive ascidians under present-day and future climate scenarios. Distance to shore and maximum sea surface temperature were identified as the most important variables affecting species distributions. Results showed that eight ascidians might respond differently to future climate change. Alarmingly, currently colonized areas are much smaller than predicted, suggesting ascidians may expand their invasive ranges. Areas such as Americas, Europe and Western Pacific have high risks of receiving new invasions. In contrast, African coasts, excluding the Mediterranean side, are not prone to new invasions, likely due to the high sea surface temperature there. Our results highlight the importance of climate change impacts on future invasions and the need for accurate modelling of invasion risks, which can be used as guides to develop management strategies. • We mapped current and future potential distributions of 8 invasive ascidians. • Distance to shore and max sea surface temperature were crucial variables. • The majority of invaders have occupied a small portion of their potential habitats. • Four species will have substantial increase in potential ranges as time progresses. [ABSTRACT FROM AUTHOR]
- Published
- 2020
- Full Text
- View/download PDF
8. Managing breaches of containment and eradication of invasive plant populations
- Author
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Helen T. Murphy, David A. Westcott, John R. Clarkson, A. C. Grice, and Cameron S. Fletcher
- Subjects
net present value ,management strategy ,Buffer zone ,Ecology ,Natural resource economics ,media_common.quotation_subject ,biological invasions ,food and beverages ,Introduced species ,macromolecular substances ,Biology ,Net present value ,Unit (housing) ,containment ,breach ,Work (electrical) ,Containment ,Biosecurity ,eradication ,weeds ,Biological dispersal ,Welfare ,health care economics and organizations ,media_common - Abstract
Containment can be a viable strategy for managing invasive plants, but it is not always cheaper than eradication. In many cases, converting a failed eradication programme to a containment programme is not economically justified. Despite this, many contemporary invasive plant management strategies invoke containment as a fallback for failed eradication, often without detailing how containment would be implemented. We demonstrate a generalized analysis of the costs of eradication and containment, applicable to any plant invasion for which infestation size, dispersal distance, seed bank lifetime and the economic discount rate are specified. We estimate the costs of adapting eradication and containment in response to six types of breach and calculate under what conditions containment may provide a valid fallback to a breached eradication programme. We provide simple, general formulae and plots that can be applied to any invasion and show that containment will be cheaper than eradication only when the size of the occupied zone exceeds a multiple of the dispersal distance determined by seed bank longevity and the discount rate. Containment becomes proportionally cheaper than eradication for invaders with smaller dispersal distances, longer lived seed banks, or for larger discount rates. Both containment and eradication programmes are at risk of breach. Containment is less exposed to risk from reproduction in the ‘occupied zone’ and three types of breach that lead to a larger ‘occupied zone’, but more exposed to one type of breach that leads to a larger ‘buffer zone’. For a well-specified eradication programme, only the three types of breach leading to reproduction in or just outside the buffer zone can justify falling back to containment, and only if the expected costs of eradication and containment were comparable before the breach. Synthesis and applications. Weed management plans must apply a consistent definition of containment and provide sufficient implementation detail to assess its feasibility. If the infestation extent, dispersal capacity, seed bank longevity and economic discount rate are specified, the general results presented here can be used to assess whether containment can outperform eradication, and under what conditions it would provide a valid fallback to a breached eradication programme. Keywords: biological invasions, breach, containment, eradication, management strategy, net present value, weeds Introduction The invasion of unwanted plants and animals into natural and agricultural systems costs billions of dollars across the globe every year. For example, the total loss of environmental welfare to the Hawaiian state from the invasion ofMiconia calvescens D.C. has been estimated at several billion dollars over a one-hundred-year period (Kaiser 2006). Production losses to agriculture due to weeds were estimated at $2·2 billion in Australia in 2001–2002 (Sindenet al. 2004; Sinden & Griffith 2007), and at over $24 billion in the United States in 2000 (Pimentelet al. 2000; Pimentel, Zuniga & Morrison 2005). In response to these costs, farmers invested $1·5 billion managing weeds in Australia in 2001–2002 (Sindenet al. 2004), and over $8 billion in the United States in 2000 (Pimentelet al. 2000; Pimentel, Zuniga & Morrison 2005). Driven by these significant impacts and investments, programmes to manage invasive plants aim to prevent the introduction of problematic species (Hulme 2006), eradicate infestations before they become established (Simberloff 2003; Panetta 2007) or contain spread if eradication fails (Hulme 2006; Panetta 2009; Radosevichet al. 2009; Panetta & Cacho 2012). From a theoretical perspective, however, many infestations are likely to be no more amenable to containment than eradication because the ecological drivers that determine containment success are the same as those that limit successful eradication. Sharov & Liebhold (1998a) illustrated that the economically optimal strategy for managing the spread of gypsy mothLymantria dispar L. in the United States changed from ‘eradication’ to ‘slowing the spread’ via a barrier zone, and eventually to ‘doing nothing’ as the area occupied by the infestation increased. Cachoet al. (2008) extended this bioeconomic approach to identify ‘critical decision points’ at which eradication, containment or no management were the most economically rational strategy for isotropically spreading scotch broomCytisus scoparius L. in Australia. Carrascoet al. (2010) extended Sharov and Liebhold's formulation to show that in many cases, the optimal choice between applying an eradication strategy or a strategy designed to slow the rate of spread applied even when parameter estimates were uncertain. Panetta & Cacho (2012) found that because containment was susceptible to breaches by rare long-distance dispersal events, surveillance and fecundity control were likely to be important components of an effective management strategy. They recently extended this work and found that the use of barrier zones was unlikely to be successful for weeds exhibiting fat-tailed dispersal with high median dispersal distances (Panetta & Cacho 2014). However, despite well-founded theoretical recognition of the limitations of containment as a management strategy, practical on-ground management programmes have continued to view containment as a default fallback option for failed eradication programmes. In Australia, for instance, of the original national plans for twenty Weeds of National Significance released in 2000 (Thorp & Lynch 2000), the management plans of only two, Athel pineTamarix aphylla (ARMCANZ & ANZECCFM 2000a) and salviniaSalvinia molesta (ARMCANZ & ANZECCFM 2000b), did not employ the term ‘containment‘. Both of those species had a reference to containment added during review in 2012 (AWC 2012a,b). Clearly, many of the simple insights into containment from the modelling literature have not achieved common acceptance within management circles. Worse yet, many strategies that identify containment as an option give insufficient guidance as to how it might be achieved in practice. This prevents the management objective being linked to the biology of the invader, its environment or the capacity of managers on the ground. To begin addressing these concerns, Griceet al. (2012) proposed a simple definition of a containment unit consisting of an occupied zone inhabited by the invasive species and a buffer zone into which propagules are dispersed (Fig.(Fig.1).1). In Griceet al.'s formulation, the width of the buffer zone is related to the ‘maximum dispersal capacity’ of the invader but, because long-distance dispersal does not exhibit a hard maximum limit, the possibility of a containment breach must be recognized (Panetta & Cacho 2012). In an earlier publication, Griceet al. (2010) identified three types of breach that could affect a containment programme. Similar criteria can also be applied to an eradication programme (Fletcheret al. 2014), and here we extend and generalize Griceet al. (2010) types of breach to consider the relative impacts of a breach on eradication and containment programmes. Figure 1 A simple model of invasion, consisting of an ‘occupied zone’ (dark shading) of radius r around the current extent of reproductive individuals, and a ‘buffer zone’ (light shading) of width d related to the effective dispersal ... We frame Griceet al. (2012) proposal in a simplification of the form pioneered by Sharov & Liebhold (1998a) and Cachoet al. (2008) to derive rules to guide land managers in determining the circumstances under which a containment strategy is likely to be more effective or efficient than an eradication strategy, the effect of a breach of the management unit on each type of management and the situations in which containment would form a valid fallback strategy for a breach in an eradication programme. We focus our analysis on well-specified systems in which eradication and containment are expected to perform comparably, and ask under what conditions a single unexpected breach or change in system specification would change the choice of management strategy.
- Published
- 2014
9. Defining Patch Mosaic Functional Types to Predict Invasion Patterns in a Forest Landscape
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Chabrerie, Olivier, Roulier, Frédéric, Hoeblich, Hélène, Sebert-Cuvillier, Emmanuelle, Closset-Kopp, Déborah, Leblanc, Isabelle, Jaminon, Jérôme, and Decocq, Guillaume
- Published
- 2007
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